Pistol barrel



FIG. 1 is a left side elevational view of a pistol barrel, the showing of a pistol base is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a plan view of the pistol barrel;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof; and,

FIG. 5 is a right side elevational view thereof with the right elevational side view being a mirror image. 

The ornamental disign for a pistol barrel, as shown and described. 